“Without his imprimatur, it will be very difficult for them [May’s Brexit proposals] to get the support of Conservative MPs and therefore the prime minister would be well advised to reconsider them,” he said on BBC Radio 5 Live.

“If the Brexit secretary could not support them they cannot genuinely be delivering Brexit,” he added.

May is expected to address the House of Commons on Friday and tell MPs that the plan agreed on Friday is the “right Brexit” for Britain.

May will also talk directly to European leaders. She said on Sunday: “Our message now is to the other side, to Europe, that it’s time to get serious and sit down and talk about it. It’s now for Europe to be prepared to sit down and move the pace of negotiations on and talk about it seriously and address what we’ve put forward.”

Nigel Farage has supported Davis’ decision to quit and has accused May of being “duplicitous”.

Register free and keep reading

The Investment Observer uses cookies to ensure that we give you the best experience on our website. This includes customising the content we show you and adverts. If you continue to use this site we will assume that you are happy with it.OkRead more